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Thread: Copland CSA 29 valves bias procedure

  1. #1
    Join Date: Aug 2017

    Location: Rome, Italy

    Posts: 3
    I'm Valerio.

    Default Copland CSA 29 valves bias procedure

    Hello guys,
    Much to my dismay, I seem to be unable to find the bias alignment procedure for my Copland CSA 29.
    I am starting to believe it uses a self-adjusting design - lol
    Seriously, i can see that it has a couple of precision trimmers on its circuit board, but the relevant adjustment procedure would be greatly appreciated.

    I would be extremely grateful if anyone could help

    Ciao from Roma

    Valerio

  2. #2
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 1,403
    I'm John.

    Default

    Hi Valerio

    Isn't this a hybrid design with a valve preamp and solid state output stage?

    If so I suspect there is no bias adjustment required.

  3. #3
    Join Date: Aug 2012

    Location: Sunny Portsmouth

    Posts: 9,165
    I'm TheMostHonestPersonYouWillMeet.

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    I had a Copland CSA28 for many years and the 29 is similar

    It is indeed a hybrid amp using a valve preamp and ss output

    As far as I remember there is no biasing needed as it's self-adjusting so I don't think I would 'fiddle' with it
    Bev


    Mark Levinson N°390s CD Through:Atlas Elektra XLR's To: Mark Levinson N°383 To: Magneplanar .7's

  4. #4
    Join Date: Aug 2017

    Location: Rome, Italy

    Posts: 3
    I'm Valerio.

    Default

    ... and I tought i was being funny when i wrote "...I am starting to believe it uses a self-adjusting design" :-)
    Thanks everyone, now i can bid on a matched pair of 6922.

    Valerio

    PS - I --SWEAR-- I am not going to fiddle with those trimmers

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